Owner's Manual
Page 1
Copyright © 2005 Honeywell International Inc. Patents pending. All rights reserved. Owner's Manual CT31 Low-voltage Thermostat Getting started Check to make sure your package includes the following items: CT31 thermostat Cover plate Wire labels Caution card Wall anchors and mounting screws (2 each) Before you begin, make sure you have: • Screwdriver • Hammer • Level (optional) • Pencil • Drill bit (3/16" for drywall, 7/32" for plaster) ® U.S. Registered Trademark.
Copyright © 2005 Honeywell International Inc. Patents pending. All rights reserved. Owner's Manual CT31 Low-voltage Thermostat Getting started Check to make sure your package includes the following items: CT31 thermostat Cover plate Wire labels Caution card Wall anchors and mounting screws (2 each) Before you begin, make sure you have: • Screwdriver • Hammer • Level (optional) • Pencil • Drill bit (3/16" for drywall, 7/32" for plaster) ® U.S. Registered Trademark.
Owner's Manual
Page 2
... out of them are attached to terminals in place Is there a sealed tube containing mercury? You may not be compatible with wires attached. If so, stop now. Leave wallplate in your old thermostat 1 Turn off power at heating/cooling system (or fuse/circuit-...breaker panel). 2 Remove cover and thermostat, but leave wallplate with your new thermostat may have 5 or more wires? If you have purchased the wrong replacement thermostat. 2 Stop installation and call 1-800-468-1502 for instructions regarding recycling and proper disposal. If...
... out of them are attached to terminals in place Is there a sealed tube containing mercury? You may not be compatible with wires attached. If so, stop now. Leave wallplate in your old thermostat 1 Turn off power at heating/cooling system (or fuse/circuit-...breaker panel). 2 Remove cover and thermostat, but leave wallplate with your new thermostat may have 5 or more wires? If you have purchased the wrong replacement thermostat. 2 Stop installation and call 1-800-468-1502 for instructions regarding recycling and proper disposal. If...
Owner's Manual
Page 3
...). 2 Level base or cover plate if desired. 3 Mark positions of both screw holes. 3 Wrap supplied labels securely around each wire, wrap it with the label matching the letter on your old thermostat. (Adhesive labels are supplied in your thermostat package.) Remove the...wires are labeled. Be careful not to let loose wires fall into the wall opening ! CT31 Low-voltage Thermostat Label wires and remove old wallplate Use a screwdriver to identify wire types. IGNORE WIRE COLORS: Use only letter designations to disconnect wires one by one.As you disconnect each wire Do not let wires...
...). 2 Level base or cover plate if desired. 3 Mark positions of both screw holes. 3 Wrap supplied labels securely around each wire, wrap it with the label matching the letter on your old thermostat. (Adhesive labels are supplied in your thermostat package.) Remove the...wires are labeled. Be careful not to let loose wires fall into the wall opening ! CT31 Low-voltage Thermostat Label wires and remove old wallplate Use a screwdriver to identify wire types. IGNORE WIRE COLORS: Use only letter designations to disconnect wires one by one.As you disconnect each wire Do not let wires...
Owner's Manual
Page 4
...match letters on terminal. 2 Use a screwdriver to loosen screw terminals, wrap bare wire securely around terminals, then tighten screws. 3 Push any excess wire back into holes until flush with your old thermostat). 4 Pull wires through cover plate (if needed to : Terminal "R" Terminal "W" Terminal "Y" Terminal ... base 1 Drill holes at pencil-marked locations (3/16" holes for drywall, 7/32" holes for plaster). 2 Use hammer to tap anchors into the wall opening. Existing wires R • RH • 4 • V W • W1 • H Y • Y1 • M G•F Rc Connect to cover marks...
...match letters on terminal. 2 Use a screwdriver to loosen screw terminals, wrap bare wire securely around terminals, then tighten screws. 3 Push any excess wire back into holes until flush with your old thermostat). 4 Pull wires through cover plate (if needed to : Terminal "R" Terminal "W" Terminal "Y" Terminal ... base 1 Drill holes at pencil-marked locations (3/16" holes for drywall, 7/32" holes for plaster). 2 Use hammer to tap anchors into the wall opening. Existing wires R • RH • 4 • V W • W1 • H Y • Y1 • M G•F Rc Connect to cover marks...